Clutch Discs and Covers
The clutch disc is the friction plate that transmits engine torque to the gearbox input shaft. The cover, or pressure plate, is the spring assembly that clamps it against the flywheel.
What it does
The disc sits between the flywheel and the pressure plate, splined to the gearbox input shaft. Diaphragm springs in the cover provide clamping force, and releasing that force disconnects the drive.
Signs a clutch disc and cover is failing
- Slipping under load with rising revs and no acceleration
- Judder or shudder as the clutch engages
- A high or inconsistent bite point
- Difficulty engaging gears
When to replace them
Replaced together as part of a clutch job rather than individually. Life depends on use rather than on a set interval.
What to confirm before ordering
Have these ready and the counter can usually confirm the part in under a minute.
- Disc diameter and spline count
- Whether the disc is sprung or rigid hub
- Cover clamp load matched to the application
- Whether the release bearing is being replaced at the same time, which it should be
Clutch Discs and Covers questions
Can the disc and cover be replaced without the release bearing?
They can, but it is the classic false economy. The bearing is the cheapest item in the assembly and the most common reason a clutch job has to be repeated.
What causes clutch judder?
Contamination of the friction surface by oil from a leaking rear main or gearbox input seal, a distorted flywheel face, or worn engine and gearbox mountings. Fitting a new disc without finding the cause repeats the fault.